British tourists could be left stranded abroad if voters choose to quit the EU, ministers warned today.

An official government report setting out the process of how Britain would leave the EU also predicted a decade of economic chaos if voters backed Brexit as the country would have to negotiate complex new trading relationships with Brussels.

But leading Out campaigner Boris Johnson today blasted the 'project fear' agenda promoted by the Government while House of Commons leader Chris Grayling insisted there was 'no evidence' behind the 24-page report.

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The official Government report published today warned that in the absence of an agreement with the EU on trade after two years, UK citizens on holiday in popular destinations such as Tenerife (pictured) would immediately face restrictions on their ability to 'move about freely'

Boris Johnson (pictured in Northern Ireland today) blasted the 'project fear' agenda after the Government published a dossier predicting 10 years of chaos if voters choose to quit the EU

The Cabinet Office review published today said the two year exit outlined in the EU treaties was unlikely.

It warned that in the absence of an agreement on trade after two years, UK citizens living, working or on holiday abroad would immediately face restrictions on their ability to 'move about freely in Europe'.

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The 'Process for withdrawing from the European Union' document added that domestically, Britain would suffer 10 years of turmoil and a range of industries - including car manufacturing, farming, financial services - would be hit by a Brexit.

And Matthew Hancock, the Cabinet Office minister, claimed that the report was only a 'cautious assessment' of the implication of Britain quitting the EU.

Boris Johnson, pictured smashing glass on a visit to a factory in Londonderry today, claimed the In campaign 'intended to provoke only one emotion in the breast of the British public and that is fear'

London Mayor Boris Johnson, left, has dismissed the Government campaign as promoting 'fear' while Commons leader Chris Grayling, right, said there was 'no evidence' behind the new report

The civil servant-authored report said: 'A vote to leave the EU would be the start, not the end, of a process. It could lead to up to a decade or more of uncertainty.'

Legally, the process to leave the EU requires the Prime Minister to trigger 'article 50' of the treaties which formally begins a two-year programme of negotiations.

Mr Hancock told the Today programme: 'It will take two years in which we go through the first part of this, which is renegotiating our relationship with EU countries.

'During that period there are businesses around Britain who say there will be risks to jobs and investment because they don't know what the future relationship will be.

Cabinet Office Minister Matt Hancock, left, insisted the report was a 'cautious' assessment of the risks. The new row comes as Sir Jeremy Heywood, the Cabinet Secretary, right, faced growing pressure over his role

Boris Johnson, pictured serving cake on a trip to Northern Ireland today, called for 'total transparency' from the Government in the run up to the 'once in a lifetime' referendum in June

'There are real consequences of this for jobs and for livelihoods. I must say this isn't only my view, it is also the view of some of the leave campaigners who have said there will be, in their words, ''pain and problems and risk and cost and uncertainty''.'

But Mr Grayling dismissed the report. He said: 'Why on earth would we think it would take quite as long as the Second World War to be able to sort out our trading relationships with Europe and elsewhere?

'I DON'T WANT SCOTLAND TO BE INDEPENDENT BECAUSE OF BREXIT,' NICOLA STURGEON INSISTS

Nicola Sturgeon (pictured in London today) said she was targeting an 'overwhelming' vote for Britain to stay in the EU and insisted she did not want Scotland to go independent because of Brexit

Nicola Sturgeon insisted today that she does not want Scotland to become independent because of Britain leaving the EU.

Scotland's First Minister used a speech in London to warn there was a 'real chance' of her country holding a second independence referendum if UK voters back Brexit in June.

Ms Sturgeon set out a positive case for staying in the 28-state bloc, telling voters that the EU was 'good for the prosperity and the well-being of individuals, families and communities across our country'.

The SNP leader said she was targeting an 'overwhelming' vote to remain in the EU in the June 23 referendum and told her fellow In campaigners south of the border to sell an 'uplifting' and 'positive' message of the EU.

Her remarks were seen as criticism of the tactics of the In campaign in the first week of the campaign, which have been described as 'Project Fear' by Out campaigners.

In a speech in central London today, Ms Sturgeon said: 'I hope that the debate that we engage in over the next few months is a thoroughly positive debate, because one of the undoubted lessons of the Scottish experience is that a miserable, negative, fear-based campaign saw the No campaign in the Scottish referendum lose over the course of the campaign a 20-point lead.

'I don't have to point out to anybody here that the In campaign in this referendum doesn't have a 20-point lead to squander.'

Insisting that she wants Scotland to vote on their own future independent of whether the UK votes to leave the EU, Ms Sturgeon added: 'If Scotland were to vote in favour of EU membership and the rest of the UK were to vote to leave - if Scotland in other words was to be outvoted - then there is a real chance that that could lead to a second referendum on Scottish independence.

'It's not what I want to happen. Of course, I do want Scotland to be independent, but I don't want Scotland to become independent because the UK chooses to leave the European Union.

'I want the UK as a whole to stay in the EU because I think that option will be better for the rest of the UK, I think it will be better for the EU and, should Scotland become independent in the future - something I believe will happen - I think it will be better for us too.

'Ireland's stance on the UK referendum is good evidence of this. Why wouldn't we want our closest neighbour also to be a member of the European Union?'

'What possible evidence is there that it would take 10 years to sort out our trading arrangements?

'If you look at our relations with the European Union, we have a £50 billion-plus trade deficit with the European Union - we buy much more from them than they buy from us.'

And Mr Johnson, writing in his Daily Telegraph column, said: 'It is now obvious that the Remain campaign is intended to provoke only one emotion in the breast of the British public and that is fear.'

The Prime Minister's official spokeswoman rejected claims the In campaign was promoting a fear agenda.

She said: 'The Prime Minister would completely reject that. 'We are clear, both the Prime Minister in terms of his responsibility and the government, to speak plainly about what the Government believes is right for the country - that is we will be better off, safer and stronger staying in a reformed EU.'

They hoped, he wrote, that voters would 'continue to sit trapped like passengers in the back seat of some errant minicab with a driver who cannot speak English and who is taking us remorselessly and expensively in the wrong direction'.

Alan Johnson, the chairman of the Labour In for Britain campaign, said: 'This report raises important questions on how Britain will disentangle itself from 40 years of co-operation with our closest allies, neighbours and biggest trading partner.

'The case put by those looking to wrench Britain out of Europe looks flimsier by the day. The leave campaign need to answer the tough questions on trade deals, rights for British citizens living and working in Europe, and access to the single market.

'Labour will continue to campaign for Britain to remain in the EU for all those reasons as well as for jobs, growth, investment, security and our influence in the world. Britain is better off remaining a member of the European Union.'

The new row comes as pressure is mounting on the head of the civil service to answer concerns over a ban on ministers pushing for a divorce from Brussels being shown some official papers.

Cabinet Secretary Sir Jeremy Heywood will be grilled by MPs on Tuesday about the edict and ministers were braced for a possible urgent question session in the Commons.

Work and Pensions Secretary Iain Duncan Smith, one of five Cabinet ministers backing 'leave', said he and Eurosceptic colleagues 'must have the right to continue to look' at material as he was 'constitutionally' in charge of his department.

Downing Street insisted the restrictions applied only to areas directly related to the referendum and had been unanimously approved by the whole Cabinet as part of an agreement allowing them to remain in the Government while opposing its official policy.

The Government's analysis, drawn up by Cabinet Office officials, concluded it was unlikely the terms of withdrawal could be fully negotiated within the formal two-year process.

Whitehall officials said that the analysis shows that an incomplete deal would open the door to other EU states demanding concessions in return for an extension.

Work on new trade deals with some of the 50-plus countries that have arrangements with the EU would be 'constrained' while the process went on, it said.

Among issues to be resolved would be health insurance, cross-border security, fishing rights and access to the agency that monitors the safety of medicines.

David Cameron, pictured left campaigning in Northern Ireland on Saturday, has faced claims he is promoting 'project fear' while Boris Johnson specifically criticised work by George Osborne, right in Shanghai, which led to a warning from the G20 about the risks posed by a Brexit to the British economy

Elsewhere today, Scotland's First Minister Nicola Sturgeon urged her fellow In campaigners south of the border to adopt more 'positive' tactics in the EU referendum, telling them not to fall in the trap of pursuing the 'miserable, negative, fear-based campaign' that undermined the No campaign in the Scottish independence referendum.

She also insisted she did not want Scotland to become independence as a consequence of Britain leaving the EU.

CAMERON TO FACE BORIS OR GOVE IN TV SHOWDOWN

David Cameron (right) could face his rival Boris Johnson (left) in a TV showdown days before the EU vote

David Cameron is set to face either Boris Johnson or Michael Gove in a TV showdown days before the EU referendum.

Brexit campaigners say one of Mr Gove and Mr Johnson will represent the Out camp in the BBC Question Time show on June 15, while Mr Cameron is expected to lead the argument for staying in the EU.

But they will not go head-to-head debate with Mr Cameron - instead the show will see each camp face a grilling from a studio audience one after the other.

A final TV debate on the EU will be held at Wembley Arena on June 21, two days before voters go to the polls, but the Prime Minister is not expected to take part.

The Wembley venue has a capacity of around 12,500 and In campaigners fear the 'bear pit' could be hijacked by Brexit fans.

Meanwhile Eurosceptics have accused of giving biased coverage of the referendum campaign so far.

Tory MP Andrew Bridgen has written to the BBC news boss James Harding with 'serious concerns' of bias in the organisation.

'The BBC is emerging as a cheerleader for those who want to remain in the EU,' he said.

Fellow Tory MP and founder of the Eurosceptics Conservatives for Britain group said it was 'essential for democracy and the credibility of the BBC that our state broadcaster is, and is seen to be, scrupulously impartial'.

Mr Harding insisted the BBC would ensure its coverage gave fair coverage to both sides of the debate.

A Downing Street source said: 'No decisions have been made or discussions held. Our opponents can talk about debates for four months if they want; we are talking about the big issues.'

But she warned unionists that there was a 'real chance' of a second independence referendum if voters do opt to cut ties with Brussels.

'If Scotland were to vote in favour of EU membership and the rest of the UK were to vote to leave - if Scotland in other words was to be outvoted - then there is a real chance that that could lead to a second referendum on Scottish independence,' she told an audience in central London.

'It's not what I want to happen. Of course, I do want Scotland to be independent, but I don't want Scotland to become independent because the UK chooses to leave the European Union.'

Mr Cameron will come under further pressure over his decision to impose a ban on pro-Brexit ministers accessing government papers that relate to the EU after Commons Speaker John Bercow granted an Urgent Question on the issue.

Leading Eurosceptic Bernard Jenkin will demand ministers explain the reasoning behind imposing the strict civil service guidance, which he claims will hinder the ability of anti-EU ministers from doing their jobs.

Mr Johnson also targeted George Osborne in his newspaper column today, accusing the Chancellor and the Treasury of 'talking up' threats to the economy by persuading G20 finance ministers to include a dramatic warning that Brexit would cause a 'shock' to the global economy in a post-summit communique.

'Surely the first time any country has used an international forum actively to talk up threats to its own economic prospects,' he wrote.

A British official said concerns had been raised well in advance of the summit by the US and China among others and dismissed the idea such countries could be told what to say as 'ridiculous'.

Conservative divisions on the issue were starkly illustrated at the weekend when Mr Duncan Smith accused Mr Cameron of showing 'a low opinion of the British people' by downplaying the UK's prospects outside the EU.

He insisted a favourable trade deal with the rest of the EU was 'very do-able'.

But Mr Cameron, who is embarking on the latest leg of a tour of question sessions around the UK, renewed his charge that opponents of continued membership were offering only 'vague' ideas of how Britain would prosper outside the EU.

Writing in the first edition of the New Day newspaper, he said: 'They tell you the grass would be greener - but they can't or won't say how.

'All that arises from their case is a string of unanswered questions. The only certainty is that their plan to take us out of Europe could lead to a decade or more of uncertainty.

'The choice is clear: between a greater Britain and the great unknown. I hope readers will choose certainty and prosperity over speculation and risk. Then we can carry on making this great country greater still.'

How will your MP vote? Full list of all the Conservative politicians who have declared their stand on the EU referendum debate

TORY MPs WHO WANT TO STAY IN EU

Name

Constituency

Guto Bebb

Aberconwy

Nick Herbert

Arundel and South Downs

Damian Green

Ashford

David Lidington

Aylesbury

Victoria Prentis

Banbury

Maria Miller

Basingstoke

Ben Howlett

Bath

Jane Ellison

Battersea

Dominic Grieve

Beaconsfield

Graham Stuart

Beverley and Holderness

David Evennett

Bexleyheath and Crayford

Paul Maynard

Blackpool North and Cleveleys

Nick Gibb

Bognor Regis and Littlehampton

Matt Warman

Boston and Skegness

David Tredinnick

Bosworth

Tobias Ellwood

Bournemouth East

Eric Pickles

Brentwood and Ongar

Simon Kirby

Brighton Kemptown

Keith Simpson

Broadland

Bob Neill

Bromley and Chislehurst

Sajid Javid

Bromsgrove

Anna Soubry

Broxtowe

Andrew Griffiths

Burton

Jo Churchill

Bury St Edmunds

Craig Whittaker

Calder Valley

Craig Williams

Cardiff North

Simon Hart

Carmarthen West and South Pembrokeshire

Mel Stride

Central Devon

Daniel Poulter

Central Suffolk and North Ipswich

Edward Argar

Charnwood

Simon Burns

Chelmsford

Greg Hands

Chelsea and Fulham

Alex Chalk

Cheltenham

Michelle Donelan

Chippenham

Mark Field

Cities of London and Westminster

Edward Timpson

Crewe and Nantwich

Gavin Barwell

Croydon Central

Chris Philp

Croydon South

Patrick McLoughlin

Derbyshire Dales

Claire Perry

Devizes

Charlie Elphicke

Dover

David Mundell

Dumfriesshire, Clydesdale and Tweeddale

Damian Hinds

East Hampshire

Sam Gyimah

East Surrey

Antoinette Sandbach

Eddisbury

Alec Shelbrooke

Elmet and Rothwell

Maggie Throup

Erewash

Helen Whately

Faversham and Mid Kent

Mike Freer

Finchley and Golders Green

Damian Collins

Folkestone and Hythe

Mark Harper

Forest of Dean

Mark Menzies

Fylde

Richard Graham

Gloucester

Byron Davies

Gower

Nicholas Boles

Grantham and Stamford

Brandon Lewis

Great Yarmouth

Anne Milton

Guildford

James Morris

Halesowen and Rowley Regis

Sir Edward Garnier

Harborough

Robert Halfon

Harlow

Andrew Jones

Harrogate and Knaresborough

Amber Rudd

Hastings and Rye

Alan Mak

Havant

John Howell

Henley

Mark Prisk

Hertford and Stortford

Oliver Dowden

Hertsmere

Guy Opperman

Hexham

Jeremy Quin

Horsham

Jonathan Djanogly

Huntingdon

Ben Gummer

Ipswich

Kris Hopkins

Keighley

Jeremy Wright

Kenilworth and Southam

James Berry

Kingston and Surbiton

Chris Skidmore

Kingswood

Nicky Morgan

Loughborough

Victoria Atkins

Louth and Horncastle

Philip Dunne

Ludlow

Theresa May

Maidenhead

Helen Grant

Maidstone and The Weald

Caroline Spelman

Meriden

George Freeman

Mid Norfolk

Sir Nicholas Soames

Mid Sussex

Nigel Huddleston

Mid Worcestershire

Sir Paul Beresford

Mole Valley

David Morris

Morecambe and Lunesdale

Robert Jenrick

Newark

Richard Benyon

Newbury

Peter Heaton-Jones

North Devon

Simon Hoare

North Dorset

Alistair Burt

North East Bedfordshire

Oliver Heald

North East Hertfordshire

Sir Roger Gale

North Thanet

Shailesh Vara

North West Cambridgeshire

Michael Ellis

Northampton North

Chloe Smith

Norwich North

Marcus Jones

Nuneaton

James Brokenshire

Old Bexley and Sidcup

Jo Johnson

Orpington

Nicola Blackwood

Oxford West and Abingdon

Rory Stewart

Penrith and The Border

Oliver Colvile

Plymouth Sutton and Devonport

Flick Drummond

Portsmouth South

Stephen Crabb

Preseli Pembrokeshire

Justine Greening

Putney

Rob Wilson

Reading East

Alok Sharma

Reading West

Crispin Blunt

Reigate

Jake Berry

Rossendale and Darwen

Mark Pawsey

Rugby

Nick Hurd

Ruislip Northwood and Pinner

Philip Hammond

Runnymede and Weybridge

Kenneth Clarke

Rushcliffe

Sir Alan Haselhurst

Saffron Walden

John Glen

Salisbury

Robert Goodwill

Scarborough and Whitby

Michael Fallon

Sevenoaks

Mark Spencer

Sherwood

Julian Smith

Skipton and Ripon

Julian Knight

Solihull

Heidi Allen

South Cambridgeshire

Lucy Frazer

South East Cambridgeshire

Alberto Costa

South Leicestershire

Gavin Williamson

South Staffordshire

James Cartlidge

South Suffolk

Robert Buckland

South Swindon

Andrew Selous

South West Bedfordshire

Gary Streeter

South West Devon

David Gauke

South West Hertfordshire

Elizabeth Truss

South West Norfolk

Jeremy Hunt

South West Surrey

Jeremy Lefroy

Stafford

Karen Bradley

Staffordshire Moorlands

Margot James

Stourbridge

Neil Carmichael

Stroud

Therese Coffey

Suffolk Coastal

George Osborne

Tatton

Mark Pritchard

The Wrekin

Kevin Hollinrake

Thirsk and Malton

Luke Hall

Thornbury and Yate

Neil Parish

Tiverton and Honiton

Thomas Tugendhat

Tonbridge and Malling

Kevin Foster

Torbay

Sarah Newton

Truro and Falmouth

Greg Clark

Tunbridge Wells

Tania Mathias

Twickenham

Alun Cairns

Vale of Glamorgan

Ed Vaizey

Wantage

David Mowat

Warrington South

Chris White

Warwick and Leamington

Richard Harrington

Watford

Peter Aldous

Waveney

Oliver Letwin

West Dorset

Matthew Hancock

West Suffolk

Harriett Baldwin

West Worcestershire

John Penrose

Weston-Super-Mare

Stephen Hammond

Wimbledon

Steve Brine

Winchester

David Cameron

Witney

Robin Walker

Worcester

Peter Bottomley

Worthing West

Ben Wallace

Wyre and Preston North

Mark Garnier

Wyre Forest

TORY MPs WHO WANT TO LEAVE EU

Name

Constituency

Sir Gerald Howarth

Aldershot

Graham Brady

Altrincham and Sale West

Nigel Mills

Amber Valley

John Baron

Basildon and Billericay

Bob Stewart

Beckenham

Richard Fuller

Bedford

Anne-Marie Trevelyan

Berwick-upon-Tweed

Chris Green

Bolton West

Conor Burns

Bournemouth West

James Cleverly

Braintree

Chris Davies

Brecon and Radnorshire

Ian Liddell-Grainger

Bridgwater and West Somerset

Andrew Percy

Brigg and Goole

Charles Walker

Broxbourne

David Nuttall

Bury North

George Eustice

Camborne and Redruth

Julian Brazier

Canterbury

Rebecca Harris

Castle Point

Cheryl Gillan

Chesham and Amersham

Andrew Tyrie

Chichester

Iain Duncan Smith

Chingford and Woodford Green

Theresa Villiers

Chipping Barnet

Christopher Chope

Christchurch

Martin Vickers

Cleethorpes

David Jones

Clwyd West

Will Quince

Colchester

Jason McCartney

Colne Valley

Fiona Bruce

Congleton

Tom Pursglove

Corby

Henry Smith

Crawley

Gareth Johnson

Dartford

Chris Heaton-Harris

Daventry

Mike Wood

Dudley South

Tim Loughton

East Worthing and Shoreham

Sir Greg Knight

East Yorkshire

Mims Davies

Eastleigh

David Burrowes

Enfield Southgate

Eleanor Laing

Epping Forest

Chris Grayling

Epsom and Ewell

Dominic Raab

Esher and Walton

Suella Fernandes

Fareham

Jack Lopresti

Filton and Bradley Stoke

Edward Leigh

Gainsborough

Rehman Chishti

Gillingham and Rainham

Caroline Dinenage

Gosport

Adam Holloway

Gravesham

David Davis

Haltemprice and Howden

Bob Blackman

Harrow East

Bernard Jenkin

Harwich and North Essex

William Wragg

Hazel Grove

Mike Penning

Hemel Hempstead

Matthew Offord

Hendon

Andrew Bingham

High Peak

Peter Lilley

Hitchin and Harpenden

Angela Watkinson

Hornchurch and Upminster

Andrew Turner

Isle of Wight

Victoria Borwick

Kensington

Philip Hollobone

Kettering

Maria Caulfield

Lewes

Michael Fabricant

Lichfield

Karl McCartney

Lincoln

John Whittingdale

Maldon

Nadine Dorries

Mid Bedfordshire

Iain Stewart

Milton Keynes South

David Davies

Monmouth

Glyn Davies

Montgomeryshire

Andrea Jenkyns

Morley and Outwood

Julian Lewis

New Forest East

Desmond Swayne

New Forest West

Anne Marie Morris

Newton Abbot

Scott Mann

North Cornwall

Stephen Barclay

North East Cambridgeshire

Ranil Jayawardena

North East Hampshire

Jacob Rees-Mogg

North East Somerset

Bill Wiggin

North Herefordshire

Owen Paterson

North Shropshire

Liam Fox

North Somerset

Justin Tomlinson

North Swindon

Craig Tracey

North Warwickshire

Kit Malthouse

North West Hampshire

Andrew Bridgen

North West Leicestershire

Henry Bellingham

North West Norfolk

James Gray

North Wiltshire

Andrew Stephenson

Pendle

Stewart Jackson

Peterborough

Robert Syms

Poole

Penny Mordaunt

Portsmouth North

Mark Francois

Rayleigh and Wickford

Karen Lumley

Redditch

Nigel Evans

Ribble Valley

Rishi Sunak

Richmond

Zac Goldsmith

Richmond Park

James Duddridge

Rochford and Southend East

Andrew Rosindell

Romford

Alan Duncan

Rutland and Melton

Nigel Adams

Selby and Ainsty

Philip Davies

Shipley

Daniel Kawczynski

Shrewsbury and Atcham

Gordon Henderson

Sittingbourne and Sheppey

Stephen Phillips

Sleaford and North Hykeham

David Warburton

Somerton and Frome

Heather Wheeler

South Derbyshire

Richard Drax

South Dorset

Sheryll Murray

South East Cornwall

John Hayes

South Holland and The Deepings

Richard Bacon

South Norfolk

Andrea Leadsom

South Northamptonshire

Seema Kennedy

South Ribble

Craig Mackinlay

South Thanet

Andrew Murrison

South West Wiltshire

Royston Smith

Southampton Itchen

David Amess

Southend West

Kwasi Kwarteng

Spelthorne

Anne Main

St Albans

Steve Double

St Austell and Newquay

Derek Thomas

St Ives

Stephen McPartland

Stevenage

James Wharton

Stockton South

Bill Cash

Stone

Nadhim Zahawi

Stratford-on-Avon

Michael Gove

Surrey Heath

Paul Scully

Sutton and Cheam

Christopher Pincher

Tamworth

Lucy Allan

Telford

Laurence Robertson

Tewkesbury

Geoffrey Clifton-Brown

The Cotswolds

Geoffrey Cox

Torridge and West Devon

Sarah Wollaston

Totnes

Boris Johnson

Uxbridge and South Ruislip

James Davies

Vale of Clwyd

Nusrat Ghani

Wealden

Graham Evans

Weaver Vale

Peter Bone

Wellingborough

Adam Afriyie

Windsor

Priti Patel

Witham

Jonathan Lord

Woking

John Redwood

Wokingham

Steven Baker

Wycombe

Marcus Fysh

Yeovil

Julian Sturdy

York Outer

Boris Johnson (pictured outside his house) angered David Cameron by announcing he will vote for Brexit

Michael Gove (pictured) is a close family friend of David Cameron but is opposing him on the EU